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The same mill will deliver interior drywall stud and exterior cold-formed steel to the same site. They are not the same bid. Interior light-gauge is the partition the commercial drywall sub already carries. Exterior CFS is backup, curtain wall, or load-bearing — wind, axial load, sheathing, a different ASTM family. Mixing them is how a … Read more

The screw on the gun is not “a drywall screw.” It is a thread, a point, and a standard. Fine thread into wood still bites; coarse thread into 25-ga steel walks or strips. That is how a hang fails before the taper opens a box. This page restates public class language from ASTM C1002 (self-piercing … Read more

On a commercial wall-and-ceiling bid the ceiling is often two trades wearing one company name. ACT (acoustical ceiling tile — grid and lay-in) is not a gypsum ceiling with a different finish. Gypsum is hang, tape, and a GA-214 level. Between them sits drywall-suspension: steel tees that take board, not tile. This page is takeoff … Read more

Cavity shaftwall and area-separation walls are why a commercial drywall sub owns 1-inch liner, J-runners, and a stud that is not a 3-5/8 drywall C. Both systems are erected from the accessible side. Both fail inspections when someone hangs leftover 5/8 Type X and calls it liner. This page is a field and takeoff sequence. … Read more